Hystrichosphaeridium perplexum
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?perplexum Varma and Dangwal, 1964, p.64, pl.1, figs.5-6. Holotype: Varma and Dangwal, 1964, pl.1, figs.5-6. Originally Hystrichosphaeridium, subsequently (and now) Hystrichosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.56) as a problematic species. Age: Eocene-Oligocene.
Parent: Hystrichosphaeridium